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Shareholders' Equity (Details)
 1 Months Ended 12 Months Ended
Mar. 05, 2019
$ / shares
shares
Mar. 09, 2017
shares
Jun. 04, 2010
USD ($)
item
$ / shares
shares
Nov. 30, 2011
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2010
$ / shares
shares
Shareholders' equity                
Common stock, shares issued 10,000,000              
Cash consideration of issuance of common stock | $         $ 44,885,000 $ 4,826,000 $ 9,264,000  
Warrants                
Warrants issued (in shares)     482,625          
Number of institutional investors | item     2          
Exercisable period of warrants     7 years          
Exercise price of warrants (in dollars per share) | $ / shares     $ 20          
Grant date fair value | $     $ 5,600,000          
Number of warrants exercised   268,125            
Warrants outstanding         0 0    
Preferred stock                
Preferred stock, shares authorized         50,000,000 50,000,000    
Preferred stock, par value (in dollars per share) | $ / shares $ 0.01       $ 0.01 $ 0.01    
Preferred Stock, shares issued         10,000,000 0    
Preferred Stock, shares outstanding         10,000,000 0    
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock 6.15%       6.15%      
Preferred Stock, Liquidation Preference, per share | $ / shares $ 25.00              
Secured Obligations                
Remaining aggregate outstanding principal amount | $         $ 13,721,295,000 $ 11,662,253,000    
Unsecured Debt                
Secured Obligations                
Remaining aggregate outstanding principal amount | $         $ 13,260,861,000 $ 11,252,785,000    
Convertible Senior Notes                
Secured Obligations                
Principal amount issued | $       $ 200,000,000.0        
Interest rate (as a percent)       3.875%        
Remaining aggregate outstanding principal amount | $       $ 151,000        
Class A Common Stock                
Shareholders' equity                
Common Stock, authorized shares         500,000,000 500,000,000   500,000,000
Common Stock, par value (in dollars per share) | $ / shares         $ 0.01 $ 0.01   $ 0.01
Common stock, shares issued         113,350,267 110,949,850    
Common stock, shares outstanding         113,350,267 110,949,850    
Warrants                
Issuance of shares upon exercise of warrants   131,001 482,625          
Class A Common Stock | Convertible Senior Notes                
Secured Obligations                
Conversion of convertible notes to Class A Common Stock | $       $ 199,800,000        
Debt Conversion, Converted Instrument, Shares Issued       6,838,546        
Class A Common Stock | Convertible Senior Notes | Weighted average                
Secured Obligations                
Share price on conversion (in dollars per share) | $ / shares       $ 29.22        
Class B Non-Voting Common Stock                
Shareholders' equity                
Common Stock, authorized shares         10,000,000 10,000,000    
Common Stock, par value (in dollars per share) | $ / shares         $ 0.01 $ 0.01    
Common stock, shares issued         0 0    
Common stock, shares outstanding         0 0